Volume II of the Fourth National Climate Assessment, released Friday, stated clearly that the global climate is changing faster than at any time in human history, primarily because of human actions. It further warned that continued inaction could cost the U.S. thousands of lives and billions of dollars. That's a conclusion that various administration officials, including the president himself, have disputed. Wheeler added his voice to the chorus during remarks made at a Washington Post event Wednesday.

"Going forward, I think we need to take a look at the modeling that's used for the next assessment," Wheeler said, as POLITICO reported.

Writing for The Huffington Post, Sara Boboltz and Alexander C. Kaufman explained why political meddling of the type Wheeler described could have serious consequences:

The announcement is concerning in light of a previous incident of political interference. In 2005, Philip Clooney, a former oil lobbyist working for the George W. Bush administration, was caught altering language in climate science reports to weaken the link between fossil fuels and rising global temperatures.

What Wheeler appeared to suggest Wednesday goes beyond that. He said the administration could take a dangerously optimistic route by developing what the EPA chief called "more realistic projections" incorporating future advancements in "technology and innovation."

Wheeler also accused the administration of former President Barack Obama of directing report authors to focus on worst-case-scenario outcomes.

"The drafting of this report was drafted at the direction of the Obama administration," Wheeler claimed at the event. "And I don't know this for a fact—I wouldn't be surprised if the Obama administration told the report's authors to take a look at the worst case scenario for this report."

Wheeler's comments echoed a misrepresentation by press secretary Sarah Huckabee Sanders that the report was based on "the most extreme modeled scenario, which contradicts long established trends," as CNN reported.

Report author and climate scientist Katharine Hayhoe took to Twitter to correct the administration's characterization of the report's use of the "worst case scenario." The report actually took pains to lay out several different emissions scenarios, she explained. But the actual rise of greenhouse gas emissions in the past 15 to 20 years is in fact closer to higher emissions scenarios.

End Climate Silence founder and Director Dr. Genevieve Guenther further laid out the problem with dismissing the report as focusing on the most extreme projections. Climate scientists typically use several different emissions trajectories that lead to different concentrations of atmospheric carbon dioxide and different temperature increases. The "worst" of these, referred to as RCP8.5, is actually based on "our current trend," Guenther pointed out.

Obama's Science Adviser John Holdren also disputed the claim that he had directed the scientists and agencies behind the report to reach any particular conclusion.

"My only instruction was that the U.S. Global Change Research Program should continue the distinguished tradition of the first three by drawing on the most current peer-reviewed science to illuminate what climate change is doing and is projected to do across the geographic regions and economic and ecological underpinnings of well-being in the United States," he told POLITICO in an email.

The national climate assessment is mandated by Congress to be released every four years. Despite Wheeler's claims, most of the recent assessment was drafted and revised while Trump, not Obama, was in office, as Hayhoe confirmed.

Sixteen-year-old climate action leader Greta Thunberg stood alongside European Commission President Jean-Claude Juncker Thursday in Brussels as he indicated—after weeks of climate strikes around the world inspired by the Swedish teenager—that the European Union has heard the demands of young people and pledged more than $1 trillion over the next seven years to address the crisis of a rapidly heating planet.

In the financial period beginning in 2021, Juncker said, the EU will devote a quarter of its budget to solving the crisis.

A new study reveals the health risks posed by the making, use and disposal of plastics. Jeffrey Phelps / Getty Images

With eight million metric tons of plastic entering the world's oceans every year, there is growing concern about the proliferation of plastics in the environment. Despite this, surprisingly little is known about the full impact of plastic pollution on human health.

But a first-of-its-kind study released Tuesday sets out to change that. The study, Plastic & Health: The Hidden Costs of a Plastic Planet, is especially groundbreaking because it looks at the health impacts of every stage in the life cycle of plastics, from the extraction of the fossil fuels that make them to their permanence in the environment. While previous studies have focused on particular products, manufacturing processes or moments in the creation and use of plastics, this study shows that plastics pose serious health risks at every stage in their production, use and disposal.